Show date of posts (#2526)

* add date to read-time.html

* add option for show_date, dynamic icon style

* change read-time to post__meta

* cleanup post__metal.html

* cleanup post__meta include variables

* put date before read time

* remove space in include variable

* allow customisation of post__meta separator

* add some documentation

* oops fix typo derp

* add post date image

* change page meta separator customisation to CSS

_includes/archive-single.html

@@ -24,9 +24,7 @@
         <a href="{{ post.url | relative_url }}" rel="permalink">{{ title }}</a>
       {% endif %}
     </h2>
-    {% if post.read_time %}
-      <p class="page__meta"><i class="far fa-clock" aria-hidden="true"></i> {% include read-time.html %}</p>
-    {% endif %}
+    {% include post__meta.html type=include.type %}
     {% if post.excerpt %}<p class="archive__item-excerpt" itemprop="description">{{ post.excerpt | markdownify | strip_html | truncate: 160 }}</p>{% endif %}
   </article>
 </div>